17
17
Jul 26, 2019
07/19
by
Hillier, Rodney
texts
eye 17
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viii, 202 p. : 25 cm. --
Topic: Gamma ray astronomy
8
8.0
Aug 8, 2019
08/19
by
Weekes, Trevor C
texts
eye 8
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comment 0
xv, 221 p. : 24 cm
Topic: Gamma ray astronomy
36
36
Aug 8, 2019
08/19
by
Aharonian, Felix A
texts
eye 36
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comment 0
xiv, 495 p. : 24 cm
Topics: Gamma ray astronomy, Cosmic rays
20
20
Jan 2, 2020
01/20
by
Ramana Murthy, P. V
texts
eye 20
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x, 248 pages : 24 cm
Topics: Astronomie gamma, Gamma ray astronomy, Gammaastronomie
Source: removedNEL
5
5.0
Jun 10, 2022
06/22
by
Gamma-Ray Burst Symposium (2003 : Santa Fe, N.M.)
texts
eye 5
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xxi, 783 p. : 24 cm
Topics: Gamma ray bursts -- Congresses, Gamma ray astronomy -- Congresses
14
14
Nov 13, 2018
11/18
by
None
texts
eye 14
favorite 0
comment 0
216 pages : 25 cm
Topics: Infrared astronomy -- Congresses, Gamma ray astronomy -- Congresses, Gamma ray astronomy, Infrared...
195
195
Jun 9, 2011
06/11
by
Joshi, B. D.; Unal, R.; White, N. H.; Morris, W. D
texts
eye 195
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With the growing use of computer modeling and simulation, in all aspects of engineering, the scope of traditional optimization has to be extended to include simulation models. Some unique aspects have to be addressed while optimizing via stochastic simulation models. The optimization procedure has to explicitly account for the randomness inherent in the stochastic measures predicted by the model. This paper outlines a general purpose framework for optimization of terminating discrete-event...
Topics: GAMMA RAY ASTRONOMY, GAMMA RAY BURSTS, AFTERGLOWS, VISUAL PHOTOMETRY, INFRARED PHOTOMETRY, GALAXIES
It has assessed the state of the field including current missions and approved future missions, the critical scientific problems open today, the promising technologies for the future, the mission priorities for the future, and the needs for data analysis and theory. This report presents a summary of the GRAPWG findings and gives detailed recommendations.
Topics: NASA Technical Reports Server (NTRS), GAMMA RAY ASTRONOMY, GRANAT SATELLITE, PRIORITIES, ENERGY...
283
283
Jun 12, 2011
06/11
by
Nasiri, Shaima L.; Baum, Bryan A.; Heymsfield, Andrew J.; Yang, Ping; Poellot, Michael R.; Kratz, David P.; Hu, Yong-Xian
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eye 283
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Detailed in situ data from cirrus clouds have been collected during dedicated field Campaigns, but the use of the size and habit distribution data has been lagging in the development of more realistic cirrus scattering models. In this study, the authors examine the use of in situ cirrus data collected during three field campaigns to develop more realistic midlatitude cirrus microphysical models. Data are used from the First International Satellite Cloud Climatology Project (ISCCP) Regional...
Topics: GAMMA RAY ASTRONOMY, GAMMA RAY BURSTS, RED SHIFT, ASTRONOMICAL MODELS, GAMMA RAY OBSERVATORY,...
313
313
May 31, 2011
05/11
by
Hedgley, David R., Jr
texts
eye 313
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A user's guide for the computer program SKETCH is presented on this disk. SKETCH solves a popular problem in computer graphics-the removal of hidden lines from images of solid objects. Examples and illustrations are included in the guide. Also included is the SKETCH program, so a user can incorporate the information into a particular software system.
Topics: GAMMA RAY ASTRONOMY, NASA PROGRAMS, PRIORITIES, GAMMA RAY BURSTS, INTERNATIONAL SPACE STATION,...
AGILE and Fermi generated dramatic progress in high-energy (> approximately 200 MeV) gamma ray science but neither instrument optimized for observations below approximately 200 MeV.
Topics: NASA Technical Reports Server (NTRS), GAMMA RAY ASTRONOMY, GAMMA RAY TELESCOPES, MISSION PLANNING,...
4
4.0
May 31, 2022
05/22
by
Vietri, Mario
texts
eye 4
favorite 1
comment 0
xvii, 554 p. : 24 cm
Topics: Astrophysics -- Textbooks, Infrared astronomy -- Textbooks, X-ray astronomy -- Textbooks, Gamma ray...
277
277
May 6, 2010
05/10
by
Wilson-Hodge, C. A.; Connaughton, V.; Finger, M.; Haynes, R. H.; Preece, R.; Rodi, J; Beklen, E.; Bhat, P. N.; Briggs, M.; Camero-Arranz, A.; Case, G.; Jenke, P.; Chaplin, V.; Cherry, M.
texts
eye 277
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Using the Gamma Ray Burst Monitor (GBM) on-board Fermi, we are monitoring the hard X-ray/ soft gamma ray sky using the Earth occultation technique. Each time a source in our catalog is occulted by (or exits occultation by) the Earth, we measure its flux using the change in count rates due to the occultation. Currently we are using CTIME data with 8 energy channels spanning 8 keV to 1 MeV for the GBM NaI detectors and spanning 150 keV to 40 MeV for the GBM BGO detectors. Our preliminary catalog...
Topics: FERMI GAMMA-RAY SPACE TELESCOPE, GAMMA RAY ASTRONOMY, LIKELIHOOD RATIO, PROBABILITY THEORY,...
Topics: NASA Technical Reports Server (NTRS), GAMMA RAY ASTRONOMY, HEAO 2, X RAY ASTRONOMY, INTERGALACTIC...
This viewgraph presentation discusses the need for multiwavelength research in terms of types of observation facilities, advances in communication, astrophysics vs. astronomy, and maximizing the scientific return from new gamma-ray facilities.
Topics: NASA Technical Reports Server (NTRS), SPECTRUM ANALYSIS, WAVELENGTHS, GAMMA RAY ASTRONOMY,...
220
220
May 30, 2011
05/11
by
Otterman, J.; Angell, J. K.; Atlas, R.; Ardizzone, J.; Demaree, G.; Jusem, J. C.; Koslowsky, D.; Terry, J
texts
eye 220
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High variability characterizes the winter climate of central Europe: interannual fluctuations in the surface-air temperature as large as 18 C over large areas are fairly common. The extraordinary early-winter 2000 in Europe appears to be a departure to an unprecedented extreme of the existing climate patterns. Such anomalous events affect agriculture, forestry, fuel consumption, etc., and thus deserve in-depth analysis. Our analysis indicates that the high anomalies of the surface-air...
Topics: ACTIVE GALACTIC NUCLEI, ASTROPHYSICS, NEUTRINOS, GAMMA RAY ASTRONOMY, ASTRONOMICAL MODELS, SPECTRAL...
I will give a brief description of Gamma-ray burst Coordinates Network (GCN) (distribution methods, filtering criteria, etc) plus the types of notices currently being distributed (GRBs, transients, & monitoring). Then cover how Stellar Observations Network Group (SONG) telescopes could make use of these notice types to fill in some of their observing time. I will then make a pitch to get SONG telescopes to contribute those data products that are consistant with the real-time transient...
Topics: NASA Technical Reports Server (NTRS), GAMMA RAY BURSTS, TELESCOPES, GAMMA RAY ASTRONOMY,...
Invited talks, rapporteur talks, and highlight talks are included. Topics of the invited and highlight talks include astrophysical jets, gamma-ray line astronomy, cosmic rays and gamma rays in astrophysics, the early universe, elementary particle physics, solar flares and acceleration of energetic particles, cosmogenic nuclei, extragalactic astronomy, composition of solar flare particles, very high energy gamma ray sources, gamma-ray bursts, shock acceleration in the solar wind, cosmic rays in...
Topics: NASA Technical Reports Server (NTRS), COSMIC RAYS, ELEMENTARY PARTICLES, GAMMA RAYS, ASTROPHYSICS,...
This brief presentation presents Swift Observatory recordings of gamma ray burst (GRB) activity. Long and short GRBs and afterglows are highlighted. Recordings of GRB emission, afterglow, optical/IR brightness, and flux density are presented. The time structure and current status of short GRB structures is also included.
Topics: NASA Technical Reports Server (NTRS), GAMMA RAY BURSTS, SWIFT OBSERVATORY, GAMMA RAY ASTRONOMY,...
487
487
May 6, 2010
05/10
by
Ryan, S.; Ordonez, E.; Christiansen, E. L.; Lear, D. M
texts
eye 487
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Open cell metallic foam core sandwich panel structures are of interest for application in spacecraft micrometeoroid and orbital debris shields due to their novel form and advantageous structural and thermal performance. Repeated shocking as a result of secondary impacts upon individual foam ligaments during the penetration process acts to raise the thermal state of impacting projectiles ; resulting in fragmentation, melting, and vaporization at lower velocities than with traditional shielding...
Topics: GAMMA RAYS, FERMI GAMMA-RAY SPACE TELESCOPE, GAMMA RAY ASTRONOMY, GAMMA RAY SOURCES (ASTRONOMY),...
6
6.0
texts
eye 6
favorite 0
comment 0
xxi, 451 pages : 24 cm
Topics: X-ray binaries -- Congresses, X-ray astronomy -- Congresses, Gamma ray bursts -- Congresses, Gamma...
We present points of special interest to potential proposers for the Compton Observatory Phase 2 Guest Investigator (GI) program. A general summary of some of the most important details of the phase 2 NASA Research Announcement (NRA) is followed by an enumeration of the modes of participation and proposal types available to GI proposers. Finally, the method which is planned for the selection of the Phase 2 Guest Investigators in parallel with the development of a preliminary Phase 2 observing...
Topics: NASA Technical Reports Server (NTRS), GAMMA RAY ASTRONOMY, GAMMA RAY OBSERVATORY, SCIENTISTS, DATA...
266
266
Jun 13, 2011
06/11
by
Penix, John; Mehlitz, Peter C
texts
eye 266
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Radiation induced Single Event Effects (SEEs) are a serious problem for spacecraft flight software, potentially leading to a complete loss of mission. Conventional risk mitigation has been focused on hardware, leading to slow, expensive and outdated on-board computing devices, increased power consumption and launch mass. Our approach is to look at SEEs from a software perspective, and to explicitly design flight software so that it can detect and correct the majority of SEES. Radiation hardened...
Topics: ACTIVE GALACTIC NUCLEI, LUMINOSITY, X RAY ASTRONOMY, GAMMA RAY ASTRONOMY, ENERGY BANDS,...
6
6.0
texts
eye 6
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comment 0
xvi, 838 pages : 28 cm
Topics: X-ray astronomy -- Instruments -- Congresses, Gamma ray astronomy -- Instruments -- Congresses,...
244
244
Jun 12, 2011
06/11
by
Demoz, Belay; Whiteman, David; Gentry, Bruce; Schwemmer, Geary; Evans, Keith; DiGirolamo, Paolo; Comer, Josep
texts
eye 244
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A large array of state-of-the-art ground-based and airborne remote and in-situ sensors were deployed during the International H2O Project (THOP), a field experiment that took place over the Southern Great Plains (SGP) of the United States from 13 May to 30 June 2002. These instruments provided extensive measurements of water vapor mixing ratio in order to better understand the influence of its variability on convection and on the skill of quantitative precipitation prediction (Weckwerth et all,...
Topics: NUCLEAR PHYSICS, WEAKLY INTERACTING MASSIVE PARTICLES, COSMIC RAYS, GAMMA RAY ASTRONOMY, GAMMA...
This project was awarded funding from the CGRO program to support ROSAT and ground-based observations of unidentified sources from data obtained by the EGRET instrument on the Compton Gamma-Ray Observatory. The critical items in the project are the individual ROSAT observations that are used to cover the 99% error circle of the unidentified EGRET source. Each error circle is a degree or larger in diameter. Each ROSAT field is about 30 deg in diameter. Hence, a number (>4) of ROSAT...
Topics: NASA Technical Reports Server (NTRS), EXPOSURE, GAMMA RAY ASTRONOMY, IDENTIFYING, GAMMA RAY SOURCES...
464
464
May 3, 2022
05/22
by
V. L. Ginzburg
texts
eye 464
favorite 2
comment 0
There are many textbooks of theoretical physics among which the many- volume work of Landau and Lifshitz is the best known and most outstanding* It is impossible, however, to deal with all problems in such a course. Moreover, even the problems which are considered can usually not be looked at from different points of view. At the same time, depending on their peculiar abilities, the nature of their training, natural inclinations, and so on, different people often prefer different approaches,...
Topics: physics, astronomy, astrophysics, radiation, electrodynamics, cherenkov radiation, superluminal...
The Swift Gamma-ray Burst Explorer is a NASA Mid-sized Explorer (MIDEX) with the primary mission of determining the origins of Gamma-Ray Bursts (GRBs). It will be the first mission to autonomously respond to newly-discovered GRBs and provide immediate follow-up with narrow field instruments capable of multi-wavelength (UV, Optical, X-ray) observations. The characteristics of GRBs that are the key mission design drivers, are their non-repeating and brief duration bursts of multi-wavelength...
Topics: NASA Technical Reports Server (NTRS), GAMMA RAY ASTRONOMY, GAMMA RAY TELESCOPES, GAMMA RAY BURSTS,...
The feasibility of developing a position-sensitive CdTe detector array for astronomical observations in the hard X-ray, soft gamma ray region is demonstrated. In principle, it was possible to improve the resolution capability for imaging measurements in this region by orders of magnitude over what is now possible through the use of CdTe detector arrays. The objective was to show that CdTe crystals of the quality, size and uniformity required for this application can be obtained with a new high...
Topics: NASA Technical Reports Server (NTRS), CADMIUM TELLURIDES, CRYSTAL GROWTH, POSITION SENSING, WAFERS,...
220
220
Jun 11, 2011
06/11
by
Cuzzi, J. N.; Mosqueira, I.; Showalter, M.; Poulet, F
texts
eye 220
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In addition to the natural curiosity inspired by their exotic appearance, planetary rings present a unique dynamical laboratory for understanding the properties of collisional particle disks that might aid in the understanding of the accretion of the planets. Ames scientists are involved in numerous different aspects of planetary ring studies.
Topics: GAMMA RAY BURSTS, OBSERVATORIES, SOLAR OPTICAL TELESCOPE, SPACEBORNE TELESCOPES, GAMMA RAY...
177
177
May 23, 2011
05/11
by
Khazanov, G. V.; Moore, T. E.; Liemohn, M. W.; Jordanova, V. K.; Fok, M.-C
texts
eye 177
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A previously-developed colissional, interhemispheric flux tube model for photoelectrons (PE) has been extended to three dimensions by including transport due to vector E x vector B and magnetic gradient-curvature drifts. Using this model, initial calculations of the high-energy (greater then 50 eV) PE distribution as a function of time, energy, pitch angle, and spatial location in the equatorial plane, are reported for conditions of low geomagnetic activity. To explore both the dynamic and...
Topics: GAS DETECTORS, EXHAUSTING, COLLECTION, AVALANCHES, GAMMA RAY ASTRONOMY, X RAYS, IMAGING TECHNIQUES,...
The new and extreme population of GRBs detected by Fermi-LAT shows several new features in high energy gamma-rays that are providing interesting and unexpected clues into GRB prompt and afterglow emission mechanisms. Over the last 6 years, it has been Swift that has provided the robust data set of UV/optical and X-ray afterglow observations that opened many windows into components of GRB emission structure. The relationship between the LAT GRBs and the well studied, fainter, less energetic GRBs...
Topics: NASA Technical Reports Server (NTRS), AFTERGLOWS, GAMMA RAY BURSTS, GAMMA RAY ASTRONOMY, SWIFT...
Ionized matter falling onto an isolated, rotating black hole will be heated sufficiently that proton-proton collisions will produce mesons, including neutral pions, which decay into gamma rays. For massive (1000 M sub circled dot), black holes, the resulting gamma-ray luminosity may exceed 10 to the 36th power engs/s, with a spectrum peaked near 20 MeV.
Topics: NASA Technical Reports Server (NTRS), BLACK HOLES (ASTRONOMY), GAMMA RAY ASTRONOMY, RADIATION...
Gamma-ray bursts are the most powerful explosions in the universe, thought to be the birth cries of black holes. It has taken 40 years of international cooperation and competition to begin to unravel the mystery of their origin. The most recent chapter in this field is being written by the SWIFT mission, a fast-response satellite with 3 power telescopes. An international team from countries all over the world participates in the chase to capture the fading light of bursts detected by SWIFT....
Topics: NASA Technical Reports Server (NTRS), GAMMA RAY BURSTS, SWIFT OBSERVATORY, GAMMA RAY ASTRONOMY,...
353
353
Aug 1, 2010
08/10
by
Smith, Guy A.; Kosten, Sue E.; Workman, Gary L
texts
eye 353
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Given here is a summary of tasks performed on two furnace systems, the Transparent Polymer (TPF) and the Rapid Melt/Rapid Quench (RMRQ) furnaces, to be used aboard NASA's KC-135. It was determined that major changes were needed for both furnaces to operate according to the scientific investigators' experiment parameters. Discussed here are what the problems were, what was required to solve the problems, and possible future enhancements. It was determined that the enhancements would be required...
Topics: ASTRONOMICAL SPECTROSCOPY, HIGH RESOLUTION, IONIZATION, PURITY, SCINTILLATION, GAMMA RAY ASTRONOMY,...
The purpose of this program was to analyse and interpret gamma-ray burst (GRB) data using both telescope mode data and single detector burst mode data from COMPTEL. Collectively, these data span the energy range from 300 keV up to 30 MeV. The initial goal of our proposal was to perform a standard analysis for each significant GRB event seen by COMPTEL. This includes GRBs that are registered by the telescope mode data as well as GRBs that are registered only in the burst mode data. (The latter...
Topics: NASA Technical Reports Server (NTRS), GAMMA RAY BURSTS, SPACEBORNE ASTRONOMY, GAMMA RAY ASTRONOMY,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), GAMMA RAY BURSTS, GAMMA RAY ASTRONOMY, GAMMA RAY SOURCES...
Spectral lags (tau(sub lag)) are deduced for 1437 long (T(sub 90) greater than 2 s) BATSE gamma-ray bursts (GRBs) with peak flux F(sub p) greater than 0.25 photons cm(sup -2)/s, near to the BATSE trigger threshold. The lags are modeled to approximate the observed distribution in the F(sub p)-T(sub lag) plane, realizing a noise-free representation. Assuming a two-branch lag-luminosity relationship, the lags are self-consistently corrected for cosmological effects to yield distributions in...
Topics: NASA Technical Reports Server (NTRS), GAMMA RAY BURSTS, GAMMA RAY ASTRONOMY, GAMMA RAY SPECTRA,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), GAMMA RAY TELESCOPES, GAMMA RAY ASTRONOMY, GAMMA RAYS,...
The Gamma-Ray Astronomy Program Working Group (GRAPWG) recommends priorities for the NASA Gamma-Ray Astronomy Program. The highest priority science topic is nuclear astrophysics and sites of gamma ray line emission. Other high priority topics are gamma ray bursts, hard x-ray emission from accreting black holes and neutron stars, the Advanced Compton Telescope (ACT), the High-resolution Spectroscopic Imager (HSI), and the Energetic X-ray Imaging Survey Telescope (EXIST). The recommendations...
Topics: NASA Technical Reports Server (NTRS), GAMMA RAY ASTRONOMY, NASA PROGRAMS, PRIORITIES, GAMMA RAY...
During the period of this contract, June 1, 1991 to November 14, 1992, the major results of our research effort have come from the Whipple air shower experiment in Tucson, AZ. The most notable development has been the discovery of TeV photons from the BL Lac object, Markarian 421. This result depended critically on the identification of Mrk 421 by the EGRET team as a source of GeV gamma rays.
Topics: NASA Technical Reports Server (NTRS), ASTROPHYSICS, BL LACERTAE OBJECTS, GAMMA RAY ASTRONOMY, GAMMA...
1,793
1.8K
Jun 12, 2011
06/11
by
Lazcano, Antonio; Bada, Jeffrey L
texts
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The field of prebiotic chemistry effectively began with a publication in Science 50 years ago by Stanley L. Miller on the spark discharge synthesis of amino acids and other compounds using a mixture of reduced gases that were thought to represent the components of the atmosphere on the primitive Earth. On the anniversary of this landmark publication, we provide here an accounting of the events leading to the publication of the paper. We also discuss the historical aspects that lead up to the...
Topics: GAMMA RAY ASTRONOMY, HOLES (ELECTRON DEFICIENCIES), GAMMA RAY TELESCOPES, GAMMA RAYS, RADIATION...
Since the launch of AGILE and FERMI, the scientific progress in high-energy (Eg greater than approximately 200 MeV) gamma-ray science has been, and will continue to be dramatic. Both of these telescopes cover a broad energy range from approximately 20 MeV to greater than 10 GeV. However, neither instrument is optimized for observations below approximately 200 MeV where many astrophysical objects exhibit unique, transitory behavior, such as spectral breaks, bursts, and flares. Hence, while...
Topics: NASA Technical Reports Server (NTRS), GAMMA RAY ASTRONOMY, GAMMA RAY TELESCOPES, ENERGY...
Gamma ray burst sources are presumably not larger than 10 to the 9th power cm as inferred from observed flux variations. If they are homogeneous and isotropically radiating, then from photon density considerations, they would have to be optically thick due to gamma-gamma pair production when assumed to be too far away. Deviations of observed photo spectra from an exponential shape around 1 MeV lead to an upper limit of the possible distance of such sources of only 2 kpc from the sun. Thus the...
Topics: NASA Technical Reports Server (NTRS), FLUX (RATE), GAMMA RAY ASTRONOMY, GAMMA RAYS, RADIATION...
No abstract available
Topics: NASA Technical Reports Server (NTRS), PULSARS, GAMMA RAY ASTRONOMY, SPACEBORNE ASTRONOMY, ACCRETION...
This slide presentation reviews the studies of Gamma Ray Bursts (GRB) with the Fermi Gamma Ray Space Telescope. Included are pictures of the observatory, with illustrations of the Large Area Telescope (LAT), and the Gamma-ray Burst Monitor (GBM) including information about both their capabilities. Graphs showing the GBM count rate over time after the GBM trigger for three GRBs, preliminary charts showing the multiple detector light curves the spectroscopy of the main LAT peak and the spectral...
Topics: NASA Technical Reports Server (NTRS), GAMMA RAY BURSTS, GAMMA RAY ASTRONOMY, FERMI GAMMA-RAY SPACE...
This has been an exiciting year for high energy gamma-ray astronomy, both from space and from ground-based observatories. It has been a particularly active period for the Whipple Observatory gamma-ray group. In phase 1 of the Compton Gamma Ray Observatory (GRO), there has not been too much opportunity for overlapping observations with the Energetic Gamma Ray Experiment Telescope (EGRET) and the other GRO telescopes; however, significant progress was made in the development of data analysis...
Topics: NASA Technical Reports Server (NTRS), GAMMA RAY ASTRONOMY, GAMMA RAY OBSERVATORY, GAMMA RAY...
This viewgraph presentation reviews the current understanding of Gamma Ray Bursts. It covers the Long GRBs, our current understanding of Collapsar, Short GRBs, afterglows, and reduced trigger threshold. It also discusses the Hard X-ray Sky Survey.
Topics: NASA Technical Reports Server (NTRS), AFTERGLOWS, GAMMA RAY BURSTS, GAMMA RAY ASTRONOMY, X RAY...
This viewgraph presentation reviews the prospects of extending the understanding of gamma ray pulsars, and answering the open questions left from the limited observations that are available from current observatories. There are 2 new gamma ray observatories that are either on orbit or will be shortly launched: (1) Astro-rivelatore Gamma a Immagini LEggero (AGILE), and Gamma-ray Large Area Space Telescope (GLAST). On board GLAST there will be two instruments Large Area Telescope (LAT), and GLAST...
Topics: NASA Technical Reports Server (NTRS), GAMMA RAY TELESCOPES, PULSARS, GAMMA RAY SOURCES (ASTRONOMY),...
This slide presentation gives an overview the Fermi Gamma-ray space telescope. It includes information on spectral fitting, useful considerations, and binned vs. unbinned likelihood.
Topics: NASA Technical Reports Server (NTRS), FERMI GAMMA-RAY SPACE TELESCOPE, GAMMA RAY ASTRONOMY,...
